LNA or PA?
give me a advice!
Hi, softstone
LNA is the first stage and the most important stage in wireless system, so choose LNA.
Cheers,
Davy
Both have their challenge. LNA means optimizing for minimum noise figure. PA means optimizing voor maximum efficiency and linearity. It is not like one design is much easier than the other.
It is my opinion in turn of difficulities (easy first) -
1. LNA;
2. filters - duplexer, SAW, etc
3. PLL;
4. Oscillator
5. Mixer;
6. Power Amplifer
Both deserve study.For me ,I will choose LNA.
Given a choice i'll go for LNA first as it's design is less demanding than a PA design. Moreover the Impedance matching is relatively better off in a LNA
I choose LNA too
I also think that the lna will be deserved for challege
Each design has it's own problem and issues. As for me, I'm doing LNA design. To be more challengiing, I would like to implement Active Inductor(noise hunger device) in LNA. Wish for my luck! :D
LNA design is relative easy .
i choose the PA
If you choose LNA Keep it intrinsecally stable (with reactive feedback).
If you choose PA Keep it as more linear as possible (with feedback)....
So start studying feedback...
for a newbie ,choose lna design is better
If you do not believe that RF energy is harmful to your health, then you can start to study PA.
How long can an LNA design be completed?
LNA is preferable for me,I like challenge
Both are good, It's dependent on your background
I think PA is more challenging. For LNA, the main concern is only noise figure. That's all. And it is quite easy to make a LNA. Of course, if you are going to design a wide-band LNA, it is not easy. But this also applies to the PA design.
For PA design, you have to consider the linearity, efficiency and output power, which are "inter-contradictive" problems. You can learn a lot from PA design.
i agree with you.do you have some good papers about PA design?
This is an article based primarily on empirical evidence, and is not the usual theoretical treatment of the subject of PA design, although it is in full agreement with the laws of physics. As such I think you will find it offers some fresh information in the spirit of amateur radio and experimentation, and will be of particular interest to QRP (10 watts SSB, 5 watts CW) aficionados.
http://www.qsl.net/km5kg/loads.htm